I don't know the exact "cost", which may be too complicated to calculate it, including car,maintenance,gas,insurrance, even tickets.... ! A2 n0 i1 E! p/ G- h q) A9 ^. U; Y, ^1 Z8 Q/ Z
For me, I think car-pool is just to share part of gas "cost" and have some fun on road..... ! R" a: H- |% P A/ _! `! V2 B5 W# r; }' o: I
I usally charge passager 30 bucks for a trip.